+
SP-5A
PROTECTION
2K /V DC AC
FUSE & DIODE
200
30
40
60
20
100
1K
0
0
0
AC
DC
50
100
150
200
250
10
20
30
40
2
4
6
8
50
10
AC
dB
DC
dB
B
AT
10 8
6 5 4
3
2
1
0
BA
T
G O
O
D
?
-20 0
+8 +12 +16
+18
+20
+22
R E P
L A C E
!
0dB:1mW600
AC V
RANGE
10
50
250
500
ADD
dB
0
14
28
34
–
OFF
10
50
DC V
150
300
MAX
300V
AC/DC
150
300V
MAX
DC
mA
50
50
0.5
O HM
X1K
10
50
150
300
AC V
Ana lo g
Multime te r
V
A
COM
COM
300
24
0
180
120
60
0
2
1. Introduction
The GMT-312 is an Analog Multimeter
capable of measuring 5 functions on 12
ranges. Small lightweight and rugged con-
struction. This meter was designed for the
homeowner, hobbyist and professional
needing to make electrical and electronic
equipment measurements.
1.1 Meter Functions
Needle
Analog
Scale
Mechanical
Zero
Adjust
Screw
Zero
Ohms
Adjust
ment
Input Jacks
Function/
Range
Selector
Switch
Contents
1. Introduction
1.1
Meter Functions
2. Specifications
2.1
For Your Safety
3. Operating Suggestions
3.1
Preliminary Adjustments
3.2
Internal Battery Condition
4. DC Voltage Measurement
4.1
Household Batteries
5. DC Milliamp Measurement
6. AC Voltage Measurement
6.1
Wall Receptacles
7. Resistance/Continuity
Measurement
7.1
Extension Cords
7.2
Fuses
7.3
Switches
8. Decibel Measurement
(Transistor Gain)
9. Battery and Fuse Replacement
10. Warranty
11. Disposal
1
Figure 1
Battery/
Fuse
Cover
HSP5 3-09 manual.qxp 5/8/09 9:57 AM Page 2
